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Re: SIGSEGV signal on Darwin OS X (Intel) when using version matching (nmap 4.01)
From: "Kelly M" <bangpath () sent as>
Date: Thu, 9 Mar 2006 00:56:06 -0500

On 3/7/06, Fyodor <fyodor () insecure org> wrote:
On Mon, Mar 06, 2006 at 08:26:41PM -0800, Kurt Grutzmacher wrote:

Easy fix is to compile libpcre outside of nmap with utf8 support and
then build nmap against that library instead. Not entirely sure why
utf8 is required, just that it's the only way to get pcre to
function. I used darwinport's pcre and it works great.

For you it works when you use a recompiled (w/UTF-8 support) libpcre.
For Kelly it works when he gives the debugging (-g) flag to the
compiler.  In both cases, I think memory is just being rearranged such
that the problem doesn't manifest itself by crashing in the same way.

In a completely unrelated project (to start learning ruby on rails), I
built libpcre using CFLAGS=-01 (which seems to be required for Intel
Macs) . Later that same night I compiled Nmap again with the -g
debugging flag, so I could post the stack trace here. But Nmap
wouldn't crash anymore. :) Confused about this, I removed the flag and
compiled Nmap again... still didn't crash. So I was miffed. But also
happy that things were working fine. I've been doing lots of scanning
to get that trace to you, but still no dice. :) So that must indeed be
a workaround for now.

But the underlying problem is likely still there and it could start
crashing with different flags or with the next release.  So while
these workarounds may be useful for the moment in allowing you to use
version detection, we really need to track down the problem and find a
real solution.  Do we have any volunteers (with an OS X Intel box) to
give it a shot?

Sure I can help out. Just let me know what I can do.

Kelly


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